Compressor



Sept. 3, 1929. E. A, COBB 1,727,049

' COMPRESSOR I Filed March 9, 1927 2 Sheeis-Sheet 1 Patented Sept. 3, 1929.

NETE STATE EUGENE A. COBB, F SWAMPSCOT'E, MASSACHUSEYEEfi COMPRESSOR.

Application filed March 9, 1927.

This invention relates to a novel and improved compressor for refrigeratin systems, and will be best understood by re erence to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be more particularly pointed out 1n the appended claims.

In the drawings:

Fig. 1 is an elevation of a compressor exemplifying the invention; s

Fig. 2 is a sectional view on line 22 of Fig. 1;

' Fig. 3 is a sectional viewon line 3-3 of Fig.1; i

Fig. 4 is a sectional view on line 44 of Fig. 3; and

Fig. 5 is a sectional view in a plane con taining the axis of the shaft, illustrating a bearing having provision to prevent leakage along the shaft.

Referring to the drawings, and to the embodiment of the invention which is'selected for exemplification, there is shown a compressor comprising two opposed cylinders presently to be described, having cylinder linings 6 (see Fig. 2), herein axially aligned, and provided with one or more, herein a plurality of lateral intake ports 7, which are covered and uncovered by pistons 8, working in said cylinder linings.

In the present example, the pistons are rigidly connected to each other, as by a rigid, yoke-like connection 9,-having an ofi'set portion 10 to clear a driving shaft 11, the ax1s of which lies in the same plane with, and intersects the common axis of the pistons. The rigid, yoke-like connection presents an opening 12 for an eccentric strap 13, and an eccentric 14, the latter being secured to the shaft, while the strap is pivoted to the rigid,

yoke-like connection, as by a pivot 15. Here-.

in, the eccentric strap is provided with a chamber 16, to contain grease or other lubricant to be supplied to the bearing surfaces of the strap and the eccentric, through an aperture 17. Lubricant may be supplied 'to this chamber through an opening 18, herein threaded to receive a plug 19. The symmetrical arrangement of the described parts is,

Serial No. 173,850.

the inner end of the shaft. The outer portion of the shaft is supported in a bearing 23, presented by a cover plate 24, which closes an opening 25 presented by the hollow body 21. The cover plate is suitably secured in place,.as by cap-screws 26, extending through the cover plate into the body of the housing. Removal of the plate permits the shaft to be withdrawn endwise from the inner bearing, and the eccentric to be withdrawn from the eccentric strap. This construction, therefore, facilitates the assembling and dismounting of the parts with a minimum number of joints.

In the present example, the cylinder linings 6 are in the form of sleeves, mounted in cylinders 27 presenting flanges 28, which 7 ton structure is shown at one end of its stroke with one piston retracted and uncovering the associated intake ports 7, and the other piston at the end of its compression stroke.

The outer ends of the cylinders are provided with cylinder heads 32, herein separate therefrom, which afi'ord convenient mountings for outlet valves 33, herein spherical in form, normally seated against valve seats 34,, presented by the cylinder heads, and thus closing outlet ports 35. Herein, the outlet valves are spring-seated, and to that end, each is associated wth a flange 36, which is urged against the valve by a helically-coiled spring 37. The plunger and its spring are mounted in a chamber 38, presented by a plate 39 which presents passages 40 leading from the outlet port. This plate is appro riately secured in place, as by screws 41 see Fig. 2) threaded into the cylinder head. i

The passages 40 communicate with an outlet chamber 42 (see Fig. 2) herein presented by a separate cover-plate 43, which is conveniently secured in place, as by cap-screws 44, which, as shown in Fig. 3, extend through the cylinder head 32 and plate 28 into the body of the housing, and thus unite these parts. Removal of these capscrews affords access to the valve, as well as to the cylmder, and permits the latter to be removed, shouldoccasion require. In the present example, the outlet chambers 42 at oppositeends of the compressor are connected by passages 45, through the cover plates 43, cylinder heads 32, plates 28 andhousing body 21, to a common outlet 46. i

v In compressors for refrigeration purposes, it is highly essential to prevent leakage of gas to the atmosphere, and to that end, I have provided novel means for preventing leakagealong the outer portion of the shaft. ferring now to Figs. 3 and 5, the shaft is provided with a collar 47, herein formed as an integral part of the shaft 11, and having its outer face formed with a plurality of V- shaped, annular projections 48, alternating with correspondingly-shaped, annular grooves 49, adapted tointerengage with corresponding annular projections 50 and grooves 51 presented by a fixed collar 52, preferably made of some soft metal, such as Babbitt metal, which will enable the confrontin faces of the two collars to become well worked in very quickly, and thus to minimize or to prevent leakage at this point.

As an additional precaution, I have provided further sealing means, herein comprising soft collars 53, such as rubber encircling and snugly fitting the shaft, and seated in cup-shaped collars 54, all received within a bore 55 presented by a hub 56 on the coverplate 24. The inner collar 54 rests against a shoulder 57, while the outer collar rests against a removable plate 58, held in place by cap-screws 59 extending through the plate, and threaded into the hub. A helically-coiled spring 60, encircling the shaft, rests at opposite ends against the soft collars 53, and urges them in opposite directions, thus squeezing and causing them to fit the shaft all the more snugly. This makes a double seal, which, added to the seal presented by the collars 47 and 52, effectively prevents leakage of the gas along the shaft, and conversely prevents the entrance of air into the intake chamber. g

Referring again to Figs. 1 and 2, the body of the housing is appropriately secured, as by cap-screws 61, to a base 62, which also affords Support for a usual condenser 63, with which there is associated a fan 64, mounted on the fshaft 11. .In practice the compressor is driven by a motor, not shown herein, which is also mounted on the base, and is directly coupled to the shaft 11. The operation of the compressor will be evident without further description.

Having thus described one embodiment of the invention, but without limiting myself thereto, what'I claim and desire by Letters Patent to secure is:

1. In a compressor, the combination of a housing including a hollow body havingan intake chamber and openings, bodies which close said openings and present two opposed cylinders extending into and having lateral intake ports communicating with said chamber, outlet valves, two pistons working in said cylinders, respectively, and means for reciprocating said pistons.

2. In a compressor, the combination of two opposed cylinders having lateral intake ports, outlet valves, two pistons working in said cylinders, respectively, piston actuating means, and a housing enclosing said piston actuating means and presenting an intake chamber communicating with said intakeports, said housing .having openings through lgvhich said cylinders extend into said chamer. I

3. In a compressor,the combination of two opposed cylinders having lateral intake ports, outlet valves at the outer ends of said cylinders, tWo pistons working in said-cylinders, respectively, piston actuating means, and a housing enclosing said piston actuating means and presenting an intake chamber communicating with said intake ports, said housing including a hollow body having openings, and bodies which close said openings and support said cylinders.

4. In a compressor, the combinationof a housing including a hollow bodyhaving an 'intake chamber and openings, bodies which close said openings and present opposed cylinders. extending into and communicating with said chamber, two pistons working in 6. In a compressor, the combination of a housing, opposed cylinders havin lateral flanges secured to opposite outer en s of said housing, and inwardly projecting bosses having lateral intake ports, an intake chamber communicating with said ports, cylinder heads, outlet chambers, and outlet passages communicating with said outlet chambers, pistons working in said cylinders, respect vely, and piston actuating means enclosed wlthin said housing.

7. In a compressor, the combination of two opposed cylinders, two rigidly connected pistons working in said cylinders,-respect1vely, a

I rigid, yoke-like connection between said pistons having an offset portion and presenting an opening, an eccentric strap received in said opening and pivoted to said connection, an eccentric cooperating with said strap to reciprocate said connection and said pistons,

and a shaft to which said eccentric is secured,

said shaft extendin across said offset portion in line with sai pistons.

8. In a compressor, the combination of a housing including a hollow body having an intake chamber and an opening a body which closes said opening and provldes a cylinder extending into and terminating within said chamber and provided with a lateral intake port afl'ording communication between said intake chamber and said cylinder, a piston working in said cylinder and extending into said chamber and covering and uncovering said port, and piston actuating means within said intake chamber.

9. In a compressor, the combination of a hollow body having an intake chamber, a cylinder extending into and terminating within said chamber and provided with a lateral intake port affording communication between said intake chamber and said cylinder, a piston working in said cylinder and extending into said chamber and covering and uncovering said port, and piston actuating means in said intake chamber.

10. In a compressor, the combination of a housing including a hollow body having an intake chamber, a cylinder opening, and a lateral opening, a cylinder received in said cylinder opening and extending into said chamber and provided with an intake port afiording communication between said intake chamber and said cylinder, a piston working in said cylinder and covering anduncovering said port, piston actuating means enclosed in said chamber, and a cover plate which closes said lateral opening and affords support for said piston actuating means.

11. In a compressor, the combination of a housing including a hollow body having an intake chamber, a cylinder opening, and a lateral opening, a cylinder received in said cylinder opening and extending into said chamber and provided with an intake port affording communication between said intake chamber and said cylinder, a piston working in said cylinder and covering and uncovering said port, piston actuating means enclosed in said chamber,'and a cover plate which closes said lateral opening and affords support for said piston actuating means, said lateral opening being of suflicient size to permit removal of said piston actuating means therethrough, and said cylinder opening being of suflicient size to permit removal of said piston therethrough after said cylinder has been removed.

12. In a compressor, the combination of a housing including a hollow body having an intake chamber and a cylinder-receiving opening, a cylinder received in said opening and terminating within said chamber and provided with a flan e about said opening and secured to said bo y, said c linder being provided with a lateral inta e port affording communication between said intake chamber and said cylinder, a piston working in said cylinder and extending into said intake chamber and covering and uncovering said port, and iston actuating means in said intake cham er.

In testimony whereof, I have signed my name to this specification.

EUGENE A. COBB. 

